BioMedical Admissions Test (BMAT) Practice Test 2026 - Free BMAT Practice Questions and Study Guide

The rate of reaction between an acid and metal is accurately measured by the volume of gas produced. This is especially relevant in reactions where hydrogen gas is generated, as is commonly the case with acids like hydrochloric acid reacting with metals like zinc or magnesium. The volume of gas produced can be collected in a gas syringe or over water and measured, providing a clear quantitative measure of how quickly the reaction occurs.

This method reflects the reaction rate because the amount of gas produced correlates with the extent of the reaction, and it can be tracked over time to determine how fast the reaction proceeds. Factors such as surface area of the metal, concentration of the acid, and temperature can affect this rate, and monitoring gas production allows for effectively analyzing these variables.

In relation to the other methods, measuring temperature change indicates exothermic or endothermic reactions but does not provide direct insight into the reaction speed. The amount of color change can be useful in some types of reactions, usually involving indicators, but it is not a standard measure for reactions between acids and metals. Reaction time might give an overall idea but is less precise than measuring gas evolution in capturing the dynamics of the reaction.